package com.ttg.utilspaidui;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
 AES 是一种可逆加密算法，对用户的敏感信息加密处理
 对原始数据进行AES加密后，在进行Base64编码转化；
 正确 */
public class TlinxAES3{
    /*已确认
     * 加密用的Key 可以用26个字母和数字组成
     * 此处使用AES-128-CBC加密模式，key需要为16位。
     */
    //private static String sKey = "4919470649194706";
    private static String sKey = "5856137858561378";
    private static String ivParameter = "PAIDUIJFPAIDUIJF";
    private static TlinxAES3 instance = null;
    //private static
    private TlinxAES3(){
    }
    public static TlinxAES3 getInstance(){
        if(instance == null){
            instance = new TlinxAES3();
        }
        return instance;
    }
    // 加密
    static String encrypt(String sSrc,String encodingFormat,String sKey,String ivParameter) throws Exception{
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw,"AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE,skeySpec,iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes(encodingFormat));
        return new BASE64Encoder().encode(encrypted);
    }
    // 解密
    public static String decrypt(String sSrc,String encodingFormat,String sKey,String ivParameter) throws Exception{
        try{
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw,"AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE,skeySpec,iv);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original,encodingFormat);
            return originalString;
        } catch(Exception ex){
            return null;
        }
    }
    public static void main(String[] args) throws Exception{
        // 需要加密的字串
        String cSrc = "123456";
        System.out.println("加密前的字串是：" + cSrc);
        // 加密
        String enString = encrypt(cSrc,"utf-8",sKey,ivParameter);
        System.out.println("加密后的字串是：" + enString);
        System.out.println("1jdzWuniG6UMtoa3T6uNLA==".equals(enString));
        // 解密
        String deString = decrypt(enString,"utf-8",sKey,ivParameter);
        System.out.println("解密后的字串是：" + deString);
    }
}
